B-body headers are supposed to fit a lowdeck engine in an A-body with just a few minor dings.
A 440 is taller and wider. Meaning less clearance everywhere, in an already tight space.
I'm betting they don't fit without serious rework.
Edit: I was referring to the generic b-body headers. Maybe Kim was answering specifically for the Hedmans.
Yes I am going 440 the block headers seem to dump right on my power steering box I have run hooker & pro part )race car) the pro parts work very good but I don’t want to cut into the wholes
So I am runner power steering and a 440